Abstract
La(Fe, Si)13-based composite plates were successfully fabricated using different amount of phenolic resin. The introduction of phenolic resin as binder increased the corrosion resistance and maintained giant magnetocaloric effect for La(Fe, Si)13-based composite plates. It was found that corroded spots were firstly observed on the boundaries between resin and La(Fe, Si)13 particles, rather than in La(Fe, Si)13-based particles, after being immersed in static distilled water. The corrosion rate decreased significantly with the increase of resin content. And the increase of the content of phenolic resin leads to the reduction of corrosion current density. Meanwhile, the volumetric magnetic entropy change ΔSM decreases slightly as the content of phenolic resin increases. The ΔSM of the plates with 3 wt.%, 5 wt.% and 8 wt.% resin are 63.1, 61.2 and 59.8 mJ/cm3 K under a low magnetic field change of 1 T, respectively.
Highlights
It is worth noticing that the heat exchange media in the magnetic refrigeration technology is water and the magnetocaloric materials are immersed into water for refrigeration.[12,13]
XRD pattern of La0.7Ce0.3Fe11.495Mn0.105Si1.4H1.48 powder and scanning electron microscopy (SEM) images of bonded La0.7Ce0.3Fe11.495Mn0.105Si1.4H1.48 plates with 3 wt.%, 5 wt.% and 8 wt.% phenolic resin were shown in Fig. 1, respectively
The result was determined from the average of 10 SEM images to ensure reliability
Summary
The magnetic refrigeration technology based on magnetocaloric effect (MCE) exhibits a brighter future than that of existing gas compression-expansion refrigeration method due to its clean and efficient energy conversion process.[1,2,3] Among various magnetocaloric materials, La(Fe, Si)13based compounds are considered to be the most promising materials for their giant MCEs and tunable Curie temperatures (T C).[4,5,6,7] Hydrogenation of La(Fe, Si)13-based compounds is usually used to tune their T C to around room temperature.[8,9] Recently, La(Fe, Si)13-based compounds are used in some experiments for the prototype of magnetic refrigerator.[2,3] the intrinsic brittleness of the hydrides hinders the formability, leading to the difficulties in practical application for magnetic refrigerator. The polymer binder is used to overcome the obstacles.[10,11] It is worth noticing that the heat exchange media in the magnetic refrigeration technology is water and the magnetocaloric materials are immersed into water for refrigeration.[12,13] the corrosion of magnetocaloric materials in water is directly related to their performance and lifetime. The investigation of corrosion behavior for polymer bonded La(Fe, Si)13Hx composites in water is of great significance. Though the corrosion mechanism of La(Fe, Si)13-based compounds have been elucidated,[14,15] few literatures reported the corrosion behavior of polymer bonded La(Fe, Si)13-based composite material in water. Phenolic resin was chosen as the binder and the influence of binder fraction on the corrosion behaviors and MCEs of La0.7Ce0.3Fe11.495Mn0.105Si1.4Hy composite plates were investigated
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
